analgesia

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13 Questions About How the Human Body Works Answered

People wearing surgical masks (also called face mask or medical masks or safety masks) walk through the city center of Milan, Italy on Feb. 23, 2020. Coronavirus disease COVID-19 pandemic

How Do Face Masks Control the Spread of Disease?

Scanning electron micrograph showing the spiral-shaped bacteria of the genus Leptospira. These organisms cause leptospirosis.

8 Zoonotic Diseases

Scan of human brain

What Are the Symptoms of a Stroke?

close up of 3d microscopic blue bacteria

What Was Life Like Before We Knew About Germs?

Discover

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

Small, white rat (genus Rattus) on a glass table. (rodent, laboratory, experiment)

Cruel and Unusual Punishments: 15 Types of Torture

Ahura Mazda - relief of the Zoroastrian god Ahura Mazda at the ancient ruins of Persepolis in Iran. Also known as Ormazd Zoroastrianism,

Which Religion Is the Oldest?

Battle of the Alamo from "Texas: An Epitome of Texas History from the Filibustering and Revolutionary Eras to the Independence of the Republic, 1897. Texas Revolution, Texas revolt, Texas independence, Texas history.

6 Wars of Independence

Easter Procession of Maria Santisima del Sacromonte in Granada, Spain. This statue is known as Virgen de los Gitanos or The Virgin of the Gypsies.

What is Holy Week?

Fish. Lionfish. Lion-fish. Turkey fish. Fire-fish. Red lionfish. Pterois volitans. Venomous fin spines. Coral reefs. Underwater. Ocean. Red lionfish swims by seaweed.

10 of the World’s Most Dangerous Fish

Two chicks near an egg with a white background (poultry, chick, chickens, birds).

What Do Eggs Have to Do with Easter?

analgesia: Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Topics

nerve nervous system disease neuralgia glioma neuritis neurofibromatosis acoustic neuroma polio Alzheimer disease concussion traumatic brain injury epilepsy

Key People

anesthesia

Henry Knowles Beecher

American anesthesiologist and researcher

Quiz

44 Questions from Britannica’s Most Popular Health and Medicine Quizzes

full human skeleton

Diseases, Disorders, and More: A Medical Quiz